Do we know when this is happening?
The FAI can also confirm that entry for the next round of Men’s and Women’s National Cup Competitions will open at the end of 2025. Online entry forms will be circulated to all affiliated leagues for distribution to their clubs and will also be accessible directly via the FAI Connect platform.
From this quote I understand it that it'll be starting right away from this season. Meaning it'll just be the 2026 FAI Junior Cup (Not the 25/26).

Happy to see this move being made and looking forward to seeing how much more competitive the non-league teams are in the first rounds of the FAI Cup as a result.